If you are using Visual Basic (VB 6) and need to open new tabs in Internet Explorer (IE 7) from code, here is some sample code that will do the trick.

Private Declare Sub VariantChangeType Lib "oleaut32" _
(Destination, Source, ByVal wFlags As Long, ByVal vt As VbVarType)
 
Private Sub Document_New()
    Dim ie As New SHDocVw.InternetExplorer
    ie.Visible = True
    Dim h As Variant
    h = CInt(&H800)
    Call VariantChangeType(h, h, 0, vbLong)
    Call ie.Navigate("www.mindfiresolutions.com")
    Call ie.Navigate("www.mindfiremobile.com", h)
End Sub

You could avoid going through hoops for hex-Variant conversion as given above and pass decimal 2048 directly:

Call ie.Navigate("www.mindfiremobile.com", 2048)

Try it, see what happens